<fieldset class="layui-elem-field layui-field-title">
    <legend>简介卡片区块</legend>
    <div class="layui-field-box">
        <div class="ul-padding-md">
            <fieldset class="layui-elem-field layui-field-title ul-field-clean">
                <legend class="legend">简介卡片区块</legend>
                <div class="layui-field-box">
                    内容区域<br>
                    内容区域<br>
                    内容区域<br>
                </div>
            </fieldset>
        </div>
    </div>
</fieldset>